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Visitors walk along a glass path that was built of the side of a cliff 300 meters above sea level on a mountain in Pingjiang, Central China’s Hunan province on May 27, 2015. The 180-meter-long interactive playful musical road featuring electronic components can make visitors play a melody when walking on it. The playful path is the first one of this kind in China.(Photo: China News Service/Yang Huafeng)
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